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1757-1146-1-S1-K2

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les journaux de football et tout les autres equipes de foot a nouveux football

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									Journal of Foot and Ankle Research
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        BioMed Central



Keynote presentation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Open Access
Sailing charted seas: biomechanics and the orthopedic
surgeon
George A Arangio

Address: Department Orthopaedic Surgery, Penn State, Milton S. Hershey Medical College
Email: George A Arangio - casarangio@aol.com




from 1st Congress of the International Foot & Ankle Biomechanics (i-FAB) community
Bologna, Italy. 4–6 September 2008

Published: 26 September 2008
Journal of Foot and Ankle Research 2008, 1(Suppl 1):K2                                                                                                                                                               doi:10.1186/1757-1146-1-S1-K2

<supplement> <title> <p>1st Congress of the International Foot &amp; Ankle Biomechanics (i-FAB) community</p> </title> <editor>Alberto Leardini, Chris Nester, Alex Stacoff and Dieter Rosenbaum</editor> <note>Meeting abstracts – A single PDF containing all abstracts in this Supplement is available <a href="http://www.biomedcentral.com/content/files/pdf/1757-1146-1-S1-full.pdf">here</a>.</note> <url>http://www.biomedcentral.com/content/pdf/1757-1146-1-S1-info.pdf</url> </supplement>




This abstract is available from: http://www.jfootankleres.com/content/1/S1/K2
© 2008 Arangio; licensee BioMed Central Ltd.




Introduction                                                                                                                                                                                                                                                                                                     moments at the medial arch joints by -79% and the talo-
Biomechanical models have been used to study the distri-                                                                                                                                                                                                                                                         navicular Joint -63% in the flattened foot.
bution of foot forces, metatarsal stresses, heel pad, arch
height, plantar aponeurosis, subtalar joint, extrinsic mus-                                                                                                                                                                                                                                                      Conclusion
cles, medial displacement calcaneal osteotomy, subtalar                                                                                                                                                                                                                                                          The model has accurately predicted the deformation of
arthroereisis and lateral column lengthening calcaneal                                                                                                                                                                                                                                                           the foot under a theoretical load of 683 Newtons. We have
osteotomy in the normal and flatfoot. We review past                                                                                                                                                                                                                                                             analyzed the effect of various surgical procedures on the
research data and discuss results as they relate to relevant                                                                                                                                                                                                                                                     flatfoot. We discussed the clinical relevance of the model
clinical topics. [1-6]                                                                                                                                                                                                                                                                                           data to the ankle sprain, 5th metatarsal stress fracture, pos-
                                                                                                                                                                                                                                                                                                                 terior tibial tendon insufficiency, the flatfoot and the
Methods                                                                                                                                                                                                                                                                                                          cavus foot.
A three dimensional multi-segment biomechanical model
[7] was used with anatomical data from normal feet, feet
made flat and corrected feet. The model includes a series
of equations that describe how the foot deforms under a
theoretical applied load of 683 Newtons (70 Kg.) on one
foot in static stance phase

Results
Lateral Column Lengthening Calcaneal Osteotomy (LCL)
decreases the forces needed by ligaments to resist


Table 1: Moments in Newton-meters (N-m)

    Joint                                                                                                                                                                                                                                      Normal Nm                                                                                              Flatfoot Nm                                                                                           Flatfoot + LCL Nm

    1st Metatarsal medial cuneiform                                                                                                                                                                                                            0.20                                                                                                   8.76                                                                                                  0.51
    Medial – cuneiform navicular                                                                                                                                                                                                               0.33                                                                                                   14.48                                                                                                 0.84
    Talo-navicular                                                                                                                                                                                                                             5.61                                                                                                   21.63                                                                                                 8.05
                                                                                                                                                                                                                                                                                                                                                                                                                                                            (-63%)
    Calcaneal-cuboid                                                                                                                                                                                                                           5.69                                                                                                   0.00                                                                                                  7.72




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Journal of Foot and Ankle Research 2008, 1(Suppl 1):K2                                 http://www.jfootankleres.com/content/1/S1/K2




Figure
Cadaver1Foot with calibrated cage and pointer for Direct Linear Transformation Photography illustrating LCL
Cadaver Foot with calibrated cage and pointer for Direct Linear Transformation Photography illustrating LCL.


Acknowledgement
Eric P Salathe Sr. PhD.

References
1.   Arangio GA, et al.: Clin Biomech 2007, 22:472-477.
2.   Arangio GA, et al.: Clin Biomech 2004, 19:847-852.
3.   Arangio GA, et al.: Clin Biomech 2001, 16:539-539.
4.   Arangio GA, et al.: Foot Ankle Int 2000, 21:216-220.
5.   Arangio GA, et al.: Foot and Ankle Surgery 1998, 4:123-128.
6.   Arangio GA, et al.: Clin Orthop 1997, 339:227-231.
7.   Salathe EP, et al.: J Biomech Eng 2002, 124:241-281.


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